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Science Experiment "Phadung Krung Kasem Canal" Reconstruction

M.5/3 Science and English section

 

First Experiment: Water transparent

Work-day:       16 November 2003

Perform Implement

1.     Zakidisk brass plate                                         1 item

2.     Waist rope                                                         1 rope

Method Experiment

1.     Bring brass plate of water first spot (Yaknopawong) observe in white precinct of brass plate.

2.     Until we can’t to see it, already stretch out brass plate quantitively rope effect between plate to water surface spot and perform thus more 3 times.

3.     Experiment more 2 place such as limited.

Consequence Experiment

Experiment

Place

Transparent (Deeply to throw light upon) (Unit: cm.)

First time

Second time

Third time

Average

Yaknoppawong

31.0

31.5

32.0

31.5

Saipanya School

40.0

38.0

39.0

39.5

Behind Unit of Water Keep litter

42.5

41.0

41.5

41.7

Experiment Conclude

To be arrange in transparent thus

·      Yaknoppawong                                        31.5 cm

·      Saipanya School                                       39.5 cm

·      Behind Unit of Water Keep litter           41.9 cm

From information Back of keep garbage is most transparent so there precinct are good receive supervise but Yaknoppawong has lowest transparent.

 


Second Experiment: Consider Acid-Base of water

Work-day:        23 November 2003

Perform Implement

1.     Universal indicator                                         1 box

2.     glass and cover                                               3 items

Method Experiment

1.     Bring glass 3 items to dip up water from 3 places such as limit together with write name of place on glass.

2.     Bring Universal indicator 1 sheet, already dip into glass number 1 and observe color of paper together with record.

3.     Thus water in more glass also makes the same as.

Consequence Experiment

Place

pH value

Color

Yaknoppawong

7 - 8

Jude green

Saipanya School

6 - 7

Green mix Yellow

Behind Unit of Water Keep litter

7 - 8

Jude green

Experiment Conclude

Standard on 5.0-9.0 so pH such as from each place have value straight to standard from environment committee.

 

 

Third Experiment: Consider of temperature

Work-day:       23 November 2003

Perform Implement

1.     Thermometer

2.     Pen

3.     Ruler or straightedge

Method Experiment

1.     Quantitative the weather temperature and record.

2.     Make defect on Thermometer by quantitative form extremity to rise up 10 cm.

3.     Dip Thermometer into water by defect make be sufficient with water surface wait until mercury constant already record.

Consequence Experiment

Place

Time (24 hr.)

Water

(Unit: ºC)

Weather

(Unit: ºC)

Deeply

(Unit: cm.)

Yaknoppawong

14.50

29.0

34.5

10

Saipanya School

15.00

28.5

30.0

10

Behind Unit of Water Keep litter

15.20

29.0

32.5

10

Experiment Conclude

 

 

Forth Experiment: Found Oxygen value in Phadung Krung Kasam Canal

Work-day:      12 December, 2003

Precinct:        Saipanya School

Purpose

1.      Able to fine Oxygen value from chemical experiment.

2.      To investigate canal thus to rule over.

Perform implement

1.       

2.       

3.       

4.       

5.       

6.       

7.       

8.       

9.       

10.    

11.   Calculator                                                                                                 1

Solution

1.      MnSO4                         2.2 mol/dm3             2 cm3

2.      KI                                  1 mol/dm3                 2 cm3

3.      H2SO4                          concentrated             2 cm3

4.      Na2S2O3                      0.005 mol/dm3         100 cm3

5.      Powder                         0.5 g                            1 cm3

6.      NaOH                           12.5 mol/dm3            2 cm3

To prepare solution

A chemical formula

                                                                       

                                                                     

                                                                           g = 0.7 gram        fill water 2 cm3

                                                                       

                                                                     

                                                                           g = 0.3 gram        fill water 2 cm3

                                                                       

                                                                     

                                                                           g = 0.08 gram     fill water 100 cm3

                                                                       

                                                                      

                                                                            g = 1 gram          fill water 2 cm3

Warning: Add acid to water must not add water to acid

Bring each solution into bigger 40 cm3 3 items and quantity bottle 2 items.

Method Lab

1.      Keep (ex) water 250 cm3 in quantity bottle also close lid.

2.      Fill MnSO4 2.2 mol/dm3 2 cm3 in (ex) water and close lid.

3.      Fill KI 1 mol/dm3 in NaOH 12.5 mol/dm3 already absorb solution into measure cylinder 2 cm3 also fill into (ex) water close lid and wait to precipitate.

4.      Bring H2SO4 intent 2 cm3 into (ex) water and reverse bottle.

5.      Bring solution from No 4. quantity 50 cm3 into bottle size 100 cm3, drop Na2S2O3 0.005 mol/dm3 until solution become yellow color.

6.      Fill powder water 1 cm3 for use indicator and tritrate also solution Na2S2O3 until solution no color.

7.      Record all Na2S2O3 quantity.

8.      Compute.

Consequence experiment thus

                                                               = 0.672 mg/dm3

Arising from water in canal shouldn’t have Oxygen lower 4 mg/dm3. But oxygen in water of canal in front Saipanya School is 0.672 mg/dm3. So water in canal in front Saipanya School has lower oxygen.

 

Reference: Chemistry Book No. 4 Ç.033, 2524